Multipressure regulator



April 10, 1928. 1,665,279

S. B. REDFIELD MULTIPRESSURE REGULATOR Filed Sept. 19, 1927 INVENTOR.nowdmlz Rwymid H15 ATTRNEY,

Patented Apr. 10, 1928;

"FFHIC T- snownm 13, REDF 'ELD, or EASTON, re'msmvama, ASSIGIN'OR oINGERSOLL-BAND COMPANY, OF JERSEY CITY, NEWZJER-SEY, A CORPORATION OFNEW JERSEY.

mumm'a' ssem REGULATOR;

application filed September 19, 1927; seri'ai no 2203a.

This inventionrelates to compressors, but more particularly, to apressure regulator adapted to operate at difie'rent pressures in" thereceiver tank for controllingthe communicationbetween theco'mpre'ssorcylinder 7 and the intake supply.

Gil'ob'ectbf'the invention is to enable automatic unloading of thecompressor cylinder at" dilferent pressures in the re-' ceive'r'and-ithus hold the ressure in the -receiver tank between a maximuman'cla minimum predetermined value.

ressure fluid at maximum ressure for Overcoming the inertia of theelement intender? to be actuated thereby and" after element has; beenset inop eration' to sup 'ly' pressure fluidtherete of lov'ver value sueien't to assurecontinued operation and age; awn-ch at the same time toactuate the unloading element of the compressor wviththe reducedoperating pressure and" thus 'm'ai tam the receiver pressuresubstantially at the desired operating pressure.

@the objects will be in part obvious and in art pointed "outhereinafter. V

' he inventioirconsistsbf the combination of'elefri'ents and arrangementof parts-hav in the general mode of operation substan tie ash'ereihafterdescribe'd and claimed accompanying d w;

, Referring w the-drawings, designates a compressor cylinder having aninlet opening B and a discharge opening C. The cylma e is provided withtheusual inlet valves D which" control commuhicationbe' tweenthein-letopening B and the co n'pressionicharnber Between the compression dancerE and the discharge "opening 0 is djsigdse d' the discharge val e F forcontroiing" communication between thesevelements.

n thprsent afia an intake unloader valve isuisposed joi er'thev inletopening Bfto tanta um ma e-sway 1:01 the cyliae-e; A. j The animatevalve illustrated 1 stand an pre sures low the maiiiinum'pres isfof'awen known type comprising a casing H inwvhich sfidably 'a'valve J forcontrollin the admission plortsK a'ndL girl the casing "The ewe J' isnormauy zle into the burner or is being supplied. V p

'In order t O'i'ne'et botho fitheserequire" merits, means are prci' ided for unloading the" compressor, either 'When it is" desired to heldopen by a spring 0 Which may be pro- I vided with suitable adjustingmeans,'as for instance, a screiv P for'regulating the ten sion of saidspring 0. V i

Connectedto the discharge opening C is a pipe Q through Which pressurefluid co npressed 7 in the compression chamber E may bec'onveyed to areceiver tank R.

In certain lines of Work einpl'oyin'g pres-fl sure fluid, it isessential that pressu'refiuid :of a high valuebe available forovercoming the inertia of the element or material intended tobe actuatedthereby: and after such element has been'set in action that/its 1constant actuation at a satisfactory speed be maintained at a lowerpressure; This" g1s particularly the case in devi'ces for feeding fuel,such as pulverized) coal; through a noZ- kiln Whichfth'e fuel maintainthe pressure in'th'e re= ceive'r B or the m nimum pressure. These meansin the present instance comprise a casing S having a pair o'fvalvechainbers' T andTI which communicate with an lntermediate chamberin the casings through ports W for admitting pressure fluid from thevalvechambers Tan'd' U into a cylinder loader valve H, and in. whichcylinder X is disposecla piston Y adaptedtc be pressed against the valveJ rbydpressur'etfluid for closing said valve J. The" piston isprothrough atmosphere, I r

valve c for controlling the aperture valve and may be attached atrearward end in any sultablemamrer to a diaphragm d clamped between thecasing S and a'eup Disposed the valve chamber T 'X farming anfintegralpart ofthe intake un- The valve may be in theforln of'a ne'e'dle i a Ushaped cover (3 in which is disposed a" spring V f. j The springif naybe calibratedto With 1 7 end andwitlritsother end. against a t-springplug which in turn bears against a set screw it in the cover 6 wherebythe tension ofthe spring: f maybe regulated. VPre'ferably, the innersurface of the diaphragm (Z is constantly exposed to pressure fluid fromthe'receiver R and such pressure fluid is conveyed to the chamber Tthrough a pipe leading from the receiver tankR,

Similar means are providedfor closing the valve J at a minimum pressurein the 'lGCClVGIi tank RV or, in otheruvords, that minimum pressure atwhich the element to be:

actuatedmay be keptin operation after the initial introduction oi. themaximum pressure'to thework. These means accordingly also comprise acover 6, a diaphragm la c Sand a needle valve 0 secured tothe diatoaffordcommunication between said-pasclamped-between said cover and thecasing phragm k for controllingcommunication be.- tween the valvechamber U and the intermediate chamber V. A springp calibrated towithstand all pressures up to-what may ibetermed thejminimum pressure inthe re .zwhichis disposed a three-way valve 8 of a well known type. Thethree-way valve a in this instance hasa.:transverse passage '5 extendingtherethrough to afford communication between the sections of the pipe gand a passage iu leadingfrom the passage t sage, t and a pipe '0 throughwhich pressure fluid maybe conveyed to the work. Thevalves has'asuitable lever w formanual operation of said valve. 7 p The operationof the device is as follows:

With'the" valve J in theposition shown, J

atmospheric air, or. pressure fiuid from a lower stage cylinder, maypass freely through the portsK and L of the casing H,

"through the inlet valve D into the compression chamber E, from whenceafter being compressed/to a higher stage, it mayjpass from the dischargevalve F, and through the connection Q, into the receiver tank R; It

then it be assumed that thevalve s has been rotatedto such a position astocutoff all communication betweenthe receiver tank'R and'the work aswell asthe valve chamber U, the pressure in the receiver tank R will:ove'rcomethe force of the spring be built up to that value at which itmay After the pressure in the tank R reaches this value, such pressureacting against'the diaphragm d willraise the valvec andpermit thepassage of pressure fluidinto the. cylinder X to act against the piston:Y "and thusfclosethe valve J and cut ofthe intake,

supply to the compressor cylinder A. The

valve J will be thus held closed as long as the pressure in the receivertank that of the spring 7. 1 p a It, with the pressure in the receivertank R- at maximum,-the valve :8 be rotated to R- exceeds the positionshown in the drawing, an ade-v V quate supply of pressure fluid of thedesired higher pressure may be admitted to the Work to impart to suchwork the initial heavy impulse required to set it in operation. At the'same time While the valve 8 is in this position, pressurefluid willenter the valve: chamber U' and, acting against the diaphragm is, willopen thelvalveo and admit pressure fluid into the cylinder X tocompressor cylinder A will remain unloaded until the pressure in thereceiver tank It has been reduced to a value which will enable thespring 39 to close the needle valve 0 and again permit the spring 0 toopen the valve J.

While two of the positions of theivalve s have been described as .wellas what follows hold the valve J closed. In this way the I i while thevalve is in these positions, it will be apparent that by turning thevalve 3 to i a position where communication may exist only between thereceiver tank R and the pipe 0 leadingto the work, the controlling meansassociated with the valve chamber U will remain inoperative and onlythat controlling means associated with the valve chamber Twill controlthe intakeunloader valve J. As a result, a'constant maximum,

pressure may be maintained in the receiver tank R for an indefiniteperiod. 5

Although only two pressure controlling devices are illustrated vinthe'drawings, one to operate at maximum pressure and the other at allpressures between the maximum v I and the minimum pressure in thereceiver tank, it will be obvious that other similar devicesmaybe-included as well as suitable controlling means, such as the valve8' to maintain constant pressures in the receiver,

tank It other than. maximum and minimum as hereinbefore described.

l claimf n 1. In a .multi-pressure regulator, the com bination of acompressor 0 linder having an'inlet opening and a disc arge opening, areceiver tank gconnected to the dischargeopening, an intake unloadingvalve controly ling the inlet'opening, a casing interposed between theintake unloader and the receiver tank having a pair of valve chambers,valves.

controlling V chambers and the unloader valve, diaphragms connected tothe valves exposed to receiver pressure,-and springs acting on. the 1'diaphragms tending to holdiths valve closed,

oneof said springs being adapted to yield to a lower receiver'pressurethan the other spring for admitting pressure fluld to the communicationbetween the unloader valve for closing said unloader valve and thus cutoil the intake'supply to the compressor cylinder. 7 V 2. In amulti-pressure regulator, the combination of a compressor cylinderhaving an .inlet opening and a discharge opening, a

receiver tank connected to the discharge opening, an intake unloadervalve controlling the inlet opening, a casing interposed between theintake unloader andthe receiver tank having a pair of valve chambers,valves controlling communication between the chambers and the unloadervalve, diaphragms connected to the valves, springs acting on thediaphragms tending to hold adapted to Withstand a greater pressure thanthe other spring, means for constantly ex-' posing that diaphragmagainst Which is exerted the greaterspring pressureito receiverpressure, andmeans for selectively exposing the otherdiaphragmto-receiver pressure for closing the unloader valve at aminimum pressure and maintain a constant predetermined minimum pressurein the receiver tank.

In testimony vvhereof I have signed this specification.

